🔒 SSL/TLS Errors

35 error notes

Error: Hostname/IP does not match certificate's altnames: Host: api.example.com is not in the cert's altnames: DNS:example.com

nodejstlsopensslssl-certificate

ssl-tlsintermediate

Fixing SSL_ERROR_NO_CYPHER_OVERLAP in Firefox: No Shared Cipher Suite Between Server and Client

SSL_ERROR_NO_CYPHER_OVERLAP

ssltlsfirefoxcipher-suite

ssl-tlsintermediate

Fixing PKIX path building failed: unable to find valid certification path in Java

sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

javassltlskeystore

ssl-tlsintermediate

Fix SSL: error:0200100D:system library:fopen:Permission denied — Nginx Can't Read Certificate Files

SSL: error:0200100D:system library:fopen:Permission denied (SSL: error:20074002:BIO routines:file_ctrl:system lib)

nginxsslpermissioncertificate

ssl-tlsintermediate

Fix x509: certificate relies on legacy Common Name field, use SANs instead in Go

x509: certificate relies on legacy Common Name field, use SANs instead

golangsslx509san

ssl-tlsintermediate

Fixing DEPTH_ZERO_SELF_SIGNED_CERT in Node.js (SSL/TLS Guide)

Error: self signed certificate (DEPTH_ZERO_SELF_SIGNED_CERT)

nodejshttpssslself-signed

ssl-tlsbeginner

Fixing NET::ERR_CERT_DATE_INVALID: Why Your Clock Breaks SSL

NET::ERR_CERT_DATE_INVALID

sslsecuritysysadminwsl2

ssl-tlsintermediate

Fixing '400 Bad Request: No required SSL certificate was sent' in mTLS

400 Bad Request: No required SSL certificate was sent

mtlsnginxclient-certificateauthentication

ssl-tlsintermediate

Fixing the SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY Connection Error

SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY

securitynginxapachessl-tls

ssl-tlsintermediate

Fixing ERR_SSL_VERSION_OR_CIPHER_MISMATCH: Modernizing Your TLS Configuration

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

ssltlssecuritynginx

ssl-tlsintermediate

How to Fix the NET::ERR_CERT_REVOKED Error (Server & Client Side)

NET::ERR_CERT_REVOKED

ssltlssecuritydevops

ssl-tlsbeginner

Fixing the SSL: WRONG_VERSION_NUMBER Error Once and For All

ssl.SSLError: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1129)

sslpythondebuggingnginx

ssl-tlsintermediate

Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH: TLS Version Not Supported on Old Servers

ERR_SSL_VERSION_OR_CIPHER_MISMATCH — The client and server don't support a common SSL protocol version or cipher suite.

ssltlsversioncipher

ssl-tlsbeginner

Fix curl Error 60: "SSL certificate problem: unable to get local issuer certificate"

curl: (60) SSL certificate problem: unable to get local issuer certificate

curlwgetsslcertificate

ssl-tlsintermediate

Fixing 'unable to verify the first certificate' SSL Chain Errors

unable to verify the first certificate — SSL certificate problem: unable to get local issuer certificate

sslnginxapachedevops

ssl-tlsbeginner

Fix ssl.SSLCertVerificationError: CERTIFICATE_VERIFY_FAILED in Python

ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)

pythonsslrequestsurllib

ssl-tlsintermediate

Fix Mixed Content Blocked: The page was loaded over HTTPS, but requested an insecure resource

Mixed Content: The page was loaded over HTTPS, but requested an insecure resource. This request has been blocked.

sslmixed-contenthttpshttp

ssl-tlsintermediate

Fixing the SSL_ERROR_RX_RECORD_TOO_LONG Error in Firefox

SSL_ERROR_RX_RECORD_TOO_LONG

sslfirefoxnginxapache

ssl-tlsintermediate

Fixing NET::ERR_CERT_AUTHORITY_INVALID: A Guide to Trusted SSL Certificates

NET::ERR_CERT_AUTHORITY_INVALID — The server's security certificate is not trusted.

sslsecuritydevopsnginx

ssl-tlsbeginner

Fix "SSL certificate problem: self-signed certificate" Error in curl and HTTP Clients

SSL certificate problem: self-signed certificate

sslself-signedcertificatecurl

ssl-tlsintermediate

Fix OCSP Stapling Failed: OCSP response has expired / ssl_stapling unauthorized (Nginx & Apache)

OCSP response has expired — ssl_stapling: OCSP response not successful (6: unauthorized)

sslocspstaplingnginx

ssl-tlsintermediate

Fix HSTS Preload Error: "You cannot visit this site right now because it uses HSTS"

You cannot visit this site right now because it uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later.

sslhstspreloadsecurity

ssl-tlsintermediate

Fix NET::ERR_CERT_COMMON_NAME_INVALID — SSL Certificate Name Mismatch Error

NET::ERR_CERT_COMMON_NAME_INVALID — The server's security certificate does not match the website's URL.

sslcertificatecommon-namesan

ssl-tlsintermediate

Fix NET::ERR_CERT_DATE_INVALID — SSL Certificate Expired Error

NET::ERR_CERT_DATE_INVALID — The server's security certificate has expired.

sslcertificateexpiredhttps

ssl-tlsintermediate

Fix Let's Encrypt "Type: unauthorized" Error — Certbot Renewal Failed

Certbot failed to authenticate some domains. The following errors were reported: Domain: example.com Type: unauthorized

sslletsencryptcertbotrenewal

ssl-tlsintermediate

Fix SSL: HANDSHAKE_FAILURE — SSL Handshake Failed When Connecting HTTPS

SSL: HANDSHAKE_FAILURE — SSL routines:ssl3_read_bytes:sslv3 alert handshake failure

sslhandshaketlsopenssl

🔒 SSL/TLS Errors

Fixing NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM: Moving Beyond SHA-1

Fixing ERR_SSL_KEY_USAGE_INCOMPATIBLE in Chrome: A TLS 1.3 Guide

Fix SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE When Your Intermediate CA Has Expired

Fix NET::ERR_CERT_COMMON_NAME_INVALID: Wildcard SSL for Multi-Level Subdomains

Fix TLSV1_ALERT_UNKNOWN_CA: Solving "curl (35) OpenSSL SSL_connect: alert unknown ca"

Fixing SSL_ERROR_UNRECOGNIZED_NAME_ALERT: A Practical SNI Troubleshooting Guide

Solving ERR_TLS_CERT_ALTNAME_INVALID: Why Node.js Rejects Your SSL Certificate

Fixing SSL_ERROR_NO_CYPHER_OVERLAP in Firefox: No Shared Cipher Suite Between Server and Client

Fixing PKIX path building failed: unable to find valid certification path in Java

Fix ERR_SSL_PROTOCOL_ERROR on Chrome When Accessing HTTPS Sites

Fix Error: UNABLE_TO_VERIFY_LEAF_SIGNATURE in Node.js HTTPS Requests

Fix x509: certificate signed by unknown authority in Docker and Kubernetes

Fix SSL: error:0200100D:system library:fopen:Permission denied — Nginx Can't Read Certificate Files

Fix x509: certificate relies on legacy Common Name field, use SANs instead in Go

Fixing DEPTH_ZERO_SELF_SIGNED_CERT in Node.js (SSL/TLS Guide)

Fixing NET::ERR_CERT_DATE_INVALID: Why Your Clock Breaks SSL

Fixing '400 Bad Request: No required SSL certificate was sent' in mTLS

Fixing the SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY Connection Error

Fixing ERR_SSL_VERSION_OR_CIPHER_MISMATCH: Modernizing Your TLS Configuration

How to Fix the NET::ERR_CERT_REVOKED Error (Server & Client Side)

Fixing the SSL: WRONG_VERSION_NUMBER Error Once and For All

Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH: TLS Version Not Supported on Old Servers

Fix curl Error 60: "SSL certificate problem: unable to get local issuer certificate"

Fixing 'unable to verify the first certificate' SSL Chain Errors

Fix ssl.SSLCertVerificationError: CERTIFICATE_VERIFY_FAILED in Python

Fix Mixed Content Blocked: The page was loaded over HTTPS, but requested an insecure resource

Fixing the SSL_ERROR_RX_RECORD_TOO_LONG Error in Firefox

Fixing NET::ERR_CERT_AUTHORITY_INVALID: A Guide to Trusted SSL Certificates

Fix "SSL certificate problem: self-signed certificate" Error in curl and HTTP Clients

Fix OCSP Stapling Failed: OCSP response has expired / ssl_stapling unauthorized (Nginx & Apache)

Fix HSTS Preload Error: "You cannot visit this site right now because it uses HSTS"

Fix NET::ERR_CERT_COMMON_NAME_INVALID — SSL Certificate Name Mismatch Error

Fix NET::ERR_CERT_DATE_INVALID — SSL Certificate Expired Error

Fix Let's Encrypt "Type: unauthorized" Error — Certbot Renewal Failed

Fix SSL: HANDSHAKE_FAILURE — SSL Handshake Failed When Connecting HTTPS